SOLUTION: How much water needs to be removed from 30 liters of a 20% salt solution to change it to a 50% salt solution?

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Question 715199: How much water needs to be removed from 30 liters of a 20% salt solution to change it to a 50% salt solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = liters of water to be removed
+.2%2A30+=+6+ liters of salt in 20% solution
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+6+%2F+%28+30+-+w+%29+=+.5+
+6+=+.5%2A%28+30+-+w+%29+
+6+=+15+-+.5w+
+.5w+=+15+-+6+
+.5w+=+9+
+w=+18+
18 liters of water should be removed